If you're driving stoned in Colorado. It's not your imagination and -- not Paris that cops are really coming after you because since pot is legal there. Police -- -- -- -- trained to spot stoned drivers the goal. -- 300 drug recognition experts on the streets by the end of next year. I'm a lot of times you can smell -- drugs but the physical indicators as far as body temperature. As far as your heart rate. As far as your blood pressure all of those are affected by each drug individually in addition to the police training Colorado is ruling out one million dollar TV at -- the message. It's -- to be sound it's not okay to be stoned and drives.

This transcript has been automatically generated and may not be 100% accurate.